"Official" challange solutions?


I was wondering if there are “official” challenge solutions. I have been able to find people posting their solutions that work. But some of the code iv seen seem to do things you don’t need to do even though it works. And i’m not sure if its them doing things that doesn’t need to be done, or if its me miss understanding the material. It would be nice if there was some sort of “answer” sheet that has professional solutions to the challenges to compare too. Is there anything like this provided? :slight_smile: